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Main Drive-Chain Contact
When the Dive-Chain is broken or elongate, the escalator will be protected.
Skirting Contacts
These
contacts have been installed at both the top and bottom of the
escalator at the transition curve. If an object gets caught between the
step and the skirting panel, the resultant pressure on the skirting
panel will actuate one of these contacts, thereby disabling and
switching off the escalator.
Handrail Inlet Contacts
The
handrail inlet contacts are located far beneath the head of the
balustrade. The handrail entry contacts are so positioned that if there
is any danger of an object becoming wedged in the handrail inlet points,
a contact will actuate and switch off the escalator.
Step chains broken contacts
Located
in the lower step-return truss, these contacts monitor the step chains
for elongation, breakage or shortening of one or both of the step
chains. When actuated, the monitoring contacts will disable and stop the
escalator’s further movement.
Step Sag contacts
Fixed
at the start sections of both inclined upper and lower transition
curves, it will be actuated to stop escalator in case step (including
step roller) sags more than 3mm or step broken.
Phase Monitor
This
is a safety feature, which monitors the main power supply’s phase. In
the event of phase failure or phase reversal. The escalator will be
stop.
Motor Overload & Overheat (Relay)
This
relay monitors the motor working condition. In case of motor over
loaded or overheated is over 120%, the escalator should be stopped.
Comb Contacts
If
a foreign object is trapped between the comb and the steps, the
resulting pressing action will move comb plates backwards and actuate
the safety contacts, thereby switching off the escalator.
Step Gap Illumination
Special
green lamps in the form of fluorescent tubes, mounted on both the top
and bottom of the escalator, make the individual steps clearly
discernible and distinguishable, especially at the horizontal runs.
Boarding the escalator is therefore made much easier for the young,
elderly and inexperienced persons.